feat: Implement CloudAsset crawler

[shravankshenoy]

Description

• Issue #247 Added support for CloudAsset resource

Changes Made

• Created client factory for CloudAsset resource : cloudasset_client.py
• Created a new crawler factory in the crawler package : cloud_asset_crawler.py
• In the scanner.py file, included the crawler in the crawl loop and updated the crawl_client_map. Also modified example.config
• Added unit tests in test_unit.py

Testing

App ran successfully during local testing

[shravankshenoy]

This is part of the output generated when I run the CloudAsset crawler. The actual list is much bigger, because of the the huge number of asset types Google Cloud supports.

Found complete list of supported asset types in the following link : https://cloud.google.com/asset-inventory/docs/supported-asset-types

{ 
"cloud_assets": [
     {
      "name": "//cloudbilling.googleapis.com/projects/circular-fusion-406401/billingInfo",
      "assetType": "cloudbilling.googleapis.com/ProjectBillingInfo",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T01:41:08.364780Z"
    },
    {
      "name": "//cloudresourcemanager.googleapis.com/projects/674352937902",
      "assetType": "cloudresourcemanager.googleapis.com/Project",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T01:41:03.707782Z"
    },
    {
      "name": "//logging.googleapis.com/projects/674352937902/locations/global/buckets/_Default",
      "assetType": "logging.googleapis.com/LogBucket",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T06:54:40.032022Z"
    },
    {
      "name": "//serviceusage.googleapis.com/projects/674352937902/services/bigquery.googleapis.com",
      "assetType": "serviceusage.googleapis.com/Service",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T13:04:03.814827Z"
    },
    {
      "name": "//serviceusage.googleapis.com/projects/674352937902/services/bigquerymigration.googleapis.com",
      "assetType": "serviceusage.googleapis.com/Service",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T13:04:03.814827Z"
    },
    {
      "name": "//serviceusage.googleapis.com/projects/674352937902/services/bigquerystorage.googleapis.com",
      "assetType": "serviceusage.googleapis.com/Service",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T13:04:03.814827Z"
    },
    {
      "name": "//serviceusage.googleapis.com/projects/674352937902/services/cloudapis.googleapis.com",
      "assetType": "serviceusage.googleapis.com/Service",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T13:04:03.814827Z"
    },
    {
      "name": "//serviceusage.googleapis.com/projects/674352937902/services/cloudasset.googleapis.com",
      "assetType": "serviceusage.googleapis.com/Service",
      "ancestors": [
        "projects/674352937902"
      ],
      "updateTime": "2023-11-27T13:04:03.814827Z"
    }
]
}